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Income Taxes - Reconciliation of Tax Expense at the Federal Statutory Tax Rate (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Tax Disclosure [Abstract] |  |  |
Tax expense at the federal statutory tax rate | $ 37,778 | $ 35,424 | $ 31,910
Increase (decrease) in tax expense from: |  |  |
Tax-exempt income, net | (756) | (663) | (571)
Modified endowment life contracts | (852) | (763) | (755)
State tax expense, net of federal tax benefit | 3,250 | 2,898 | 1,469
Utilization of tax credits: |  |  |
New markets tax credits | (1,254) | (1,195) | (1,108)
Low-income housing tax credits, net of amortization | (1,424) | (1,274) | (1,209)
Other tax credits | (319) | (248) | (1,979)
Other, net | 840 | 861 | (473)
Total income taxes | $ 37,263 | $ 35,040 | $ 27,284

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 + Details
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